Search for lepton-flavor-violating τ− → μ−μ+μ− decays at Belle II

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dc.contributor.authorAdachi, I.
dc.contributor.authorAggarwal, L.
dc.contributor.authorAihara, H.
dc.contributor.authorAkopov, N.
dc.contributor.authorAloisio, A.
dc.contributor.authorAlthubiti, N.
dc.contributor.authorAnh Ky, N.
dc.contributor.authorAsner, D.M.
dc.contributor.authorAtmacan, H.
dc.contributor.authorAushev, V.
dc.contributor.authorAversano, M.
dc.contributor.authorAyad, R.
dc.contributor.authorBabu, V.
dc.contributor.authorBae, H.
dc.contributor.authorBahinipati, S.
dc.contributor.authorBambade, P.
dc.contributor.authorBanerjee, S.
dc.contributor.authorBansal, S.
dc.contributor.authorBarrett, M.
dc.contributor.authorBaudot, J.
dc.contributor.authoret al.
dc.date.issued2024
dc.description.abstractWe present the result of a search for the charged-lepton-flavor violating decay τ− → μ−μ+μ− using a 424 fb−1 sample of data recorded by the Belle II experiment at the SuperKEKB e+e− collider. The selection of e+e− → τ+τ− events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a 90% confidence level upper limit of 1.9 × 10−8 on the branching fraction of the τ− → μ−μ+μ− decay, which is the most stringent bound to date.
dc.description.statementofresponsibilityThe Belle II collaboration
dc.identifier.citationThe Journal of High Energy Physics, 2024; 2024(9):62-1-62-22
dc.identifier.doi10.1007/jhep09(2024)062
dc.identifier.issn1029-8479
dc.identifier.issn1029-8479
dc.identifier.orcidDe La Motte, S.A. [0000-0003-3905-6805]
dc.identifier.orcidHarris, C. [0000-0003-0448-4244]
dc.identifier.urihttps://hdl.handle.net/2440/144003
dc.language.isoen
dc.publisherSpringerOpen
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101792
dc.relation.granthttp://purl.org/au-research/grants/arc/DP210101900
dc.relation.granthttp://purl.org/au-research/grants/arc/DP210102831
dc.relation.granthttp://purl.org/au-research/grants/arc/DE220100462
dc.relation.granthttp://purl.org/au-research/grants/arc/LE210100098
dc.relation.granthttp://purl.org/au-research/grants/arc/LE230100085
dc.rights© The Authors. Article funded by SCOAP3. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
dc.source.urihttp://dx.doi.org/10.1007/jhep09(2024)062
dc.subjecte +-e − Experiments, Flavour Physics, Tau Physics
dc.titleSearch for lepton-flavor-violating τ− → μ−μ+μ− decays at Belle II
dc.typeJournal article
pubs.publication-statusPublished online

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